1. Automatic rebound design.The roller is designed with simple sliding automatic rebound technology to reduce wheel swing and help you control movements. 2.Exercise the whole body.upgrade two wheel automatic rebound, triangular structure, stable and safe, in accordance with ergonomics. Double spring strong rebound design enhances the strength and clarity of your abs, back, arms, chest and shoulder muscles. It also helps to burn calories and build a better body. 3.High quality automatic rebound belly wheel is made of stable, environmentally friendly plastic and sponge, which is non-slip, sweat absorbing and comfortable.It also has automatic rebound function to increase safety. The handle is easy to remove or install and more convenient to carry. 4.Automatic rebound belly roller,belly roller can be used to crush fat and help you shape your body. It can help stretch and train the abdominal, arm, chest, shoulder and back muscles and obtain six abs. The practice wheel helps to strengthen your core strength. 5.Intimate cell phone bracket,automatic rebound belly wheel integrates a cell phone bracket. If you are a beginner, this bracket can help you watch the lesson video more easily and you can watch and practice while watching. As your body gets better, you can put your mobile phone on the shelf to play sensational music. Material: PP TPR Color: blue, red, orange, light blue Size: 37.25cm, Wheel-10cm Package Size: 26.17.512CM